Actual target to achieve a java plug-naming format specification check
Class or interface with hump nomenclature, the first letter capitalized
Method, in line with hump nomenclature, the first letter lowercase
Field:
Class or instance variables: meet hump Nomenclature, the first letter lowercase
Constants: require all capital letters or the underscore, and the first character can not be an underscore
Javac compiler to add an extra feature, when compiling the program checks whether the procedures meet the above criteria.